A method of testing position independent geometric errors in rotary axes of a five-axis machine tool using a double ball bar |
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| Affiliation: | 1. Manufacturing Automation Laboratory, Department of Mechanical Engineering, The University of British Columbia, Vancouver, BC, Canada V6T 1Z4;2. School of Mechanical Science and Engineering, State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;3. Département de génie mécanique, École Polytechnique de Montréal, C.P. 6079, Succ. Centre-ville, Montréal (QC), Canada H3C 3A7;1. Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin 300072, China;2. School of Engineering, The University of Warwick, Coventry CV4 7AL, UK;1. School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, Fujian, PR China;2. College of Computer Science and Technology, Zhejiang University of Technology, Hangzhou, Zhejiang, PR China;1. School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, PR China;2. Manufacturing Automation Laboratory, Department of Mechanical Engineering, The University of British Columbia, Vancouver, BC, Canada, V6T 1Z4 |
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| Abstract: | Ensuring that a five-axis machine tool is operating within tolerance is critical. However, there are few simple and fast methods to identify whether the machine is in a “usable” condition. This paper investigates the use of the double ball bar (DBB) to identify and characterise the position independent geometric errors (PIGEs) in rotary axes of a five-axis machine tool by establishing new testing paths. The proposed method consists of four tests for two rotary axes; the A-axis tests with and without an extension bar and the C-axis tests with and without an extension bar. For the tests without an extension bar, position errors embedded in the A- and C-axes are measured first. Then these position errors can be used in the tests with an extension bar, to obtain the orientation errors in the A- and C-axes based on the given geometric model. All tests are performed with only one axis moving, thus simplifying the error analysis. The proposed method is implemented on a Hermle C600U five-axis machine tool to validate the approach. The results of the DBB tests show that the new method is a good approach to obtaining the geometric errors in rotary axes, thus can be applied to practical use in assembling processes, maintenance and regular checking of multi-axis CNC machine tools. |
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| Keywords: | Five-axis machine tool Double ball bar Position independent geometric error Rotary axis |
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